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Old 23rd August 2011, 05:01 PM   #31
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Quote:
Originally Posted by CharlieLaub View Post
have you considered using the TDA7293 for parallel applications?
Thank you for your suggestion. I was thinking to include TDA7294. TDA7293 is definitely a better choice for parallel. I will test it after 3886.

Quote:
Originally Posted by CharlieLaub View Post
I would love for you (Panson_HK) to whip up a board using 3 or 4 of these in parallel, or something that the user could build as 2,3, or 4 in parallel by adding components as needed. I have a design for a dual board with some tips on selection of components to keep the TDA7293 doing what they should, which can be tricky. PM me if you want the details.
Yes, this is being considered. I will either make a board for, say, 4 x parallel or a 2 x parallel board easing for 4 x, 6 x ... parallel.

I will send you a PM. Thank you.
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Old 23rd August 2011, 05:09 PM   #32
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Originally Posted by geraldfryjr View Post
I have been Contemplating a 4xLm4780 to drive my ESL panels that are in the 1 ohm load range.
Right now I still have 5 chips and I will start with those and if it proves to perform well I can always get more of them to finish the project.

Thanks again. jer
You are welcome. All the channels (4 x 2) will be configured in x 4 parallel stereo or x 8 parallel mono?
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Old 24th August 2011, 03:47 AM   #33
jcx is offline jcx  United States
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ESL panel C often resonate with step up Xfmr leakage L to give big peak just beyond 20KHz
I've seen impedance plots that suggest a few Ohms series R in the amp would be a good thing

you can make this up with the current sharing R - damps the resonance, protects the amp chips from destablizing cable Cload - but the R need to be big to handle the power loss at the top of the audio range into the transformed C of the panel
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Old 25th August 2011, 07:23 AM   #34
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Data for a higher rails +/- 40 are presented here.
Attached Images
File Type: jpg THD vs power 20k 4Ohm rails.jpg (282.0 KB, 163 views)
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Old 26th August 2011, 12:37 AM   #35
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i have make single circuit from lm3886 and parallel lm3886.single circuit work fine.but parallel 3 chip make hum.i don't know what the problem.i draw and etching my own.here some picture my last gainclone .i hope anybody can explain to me.why hum happen.
download here some picture project.thanks
singlechip
3 parallel chip
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Old 26th August 2011, 12:58 AM   #36
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Sasek, if you want help please post a schematic, those pictures don't provide the needed information.

Mike
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